Writing instrument cap



FIG. 1 is a top, left front perspective view of a writing instrument cap showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view, the left side being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

FIGS. 2 through 6 have been drawn to a reduced scale with respect to FIG. 1. 

The ornamental design for writing instrument cap, as shown and described. 